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. 2018 Mar 27;11(1):195.
doi: 10.1186/s13104-018-3315-8.

Unexpected association between subclinical hearing loss and restorative sleep in a middle-aged and elderly Japanese population

Kei Nakajima  1 , Eiichiro Kanda  2 , Kaname Suwa  3
Affiliations

Unexpected association between subclinical hearing loss and restorative sleep in a middle-aged and elderly Japanese population

Kei Nakajima et al. BMC Res Notes. .

Abstract

Objective: Hearing loss may be associated with certain sleep abnormalities. We recently reported that subclinical hearing loss (SHL) was more prevalent in individuals in a broad Japanese population who slept longer than 8 h; however, the underlying mechanism was unknown. Therefore, we investigated the association between SHL and self-reported restorative sleep (RS), assessed by questionnaire, in a database of 33,888 Japanese aged 40-69 years without overt or diagnosed hearing loss (20,225 men, 13,663 women).

Results: The proportion of individuals with RS (more than half of the subjects) was significantly higher in the group with bilateral than with unilateral SHL at 4000 Hz and intact hearing; however, that was not the case at 1000 Hz, independent of age (P < 0.0001, two-way analysis of variance). Multivariate logistic regression analysis showed that bilateral SHL at 4000 Hz, but not at 1000 Hz, was significantly associated with RS. This relationship was independent of potential relevant confounders, including age, sex, and cardiometabolic risk factors. The present study extends our earlier work by revealing an unexpected association between early hearing impairment and satisfactory sleep in a middle-aged and elderly population. This association requires further confirmation regarding the possible underlying mechanism and clinical relevance.

Keywords: Age-related hearing loss; Bilateral hearing loss; Cardiometabolic risk; Cognitive impairment; Hearing loss; High frequency; Restorative sleep.

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Figures

Fig. 1
Fig. 1
Proportions of subjects with RS by age-group The small vertical bars represent the standard error with RS numbered as 1 and non-RS as 0. The proportion of subjects with RS in their 50 s and 60 s significantly rose with increasing SHL (P = 0.004 and P = 0.001, respectively, one-way ANOVA). *Significant difference compared with intact hearing (Bonferroni test) in each age-group. RS restorative sleep
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